Segment and Related Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information [Line Items]
Interest income	$ 68,768	$ 63,038	$ 56,170
Interest expense	9,674	7,291	6,316
Noninterest income	13,274	14,227	13,505
Income (loss) before income taxes	28,225	26,075	23,308
Net income (loss)	22,579	15,249	16,301
Depreciation and amortization	2,040	2,405	2,856
Total assets	1,862,866	1,816,078	1,678,638
Goodwill	43,872	43,872	43,872
Capital expenditures	2,723	2,648	3,613
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Interest income	68,388	62,697	56,076
Interest expense	8,272	6,263	5,438
Noninterest income	8,619	9,224	8,848
Income (loss) before income taxes	28,000	24,828	22,230
Net income (loss)	22,381	14,456	15,486
Depreciation and amortization	2,030	2,393	2,845
Total assets	1,853,057	1,806,647	1,669,629
Goodwill	43,872	43,872	43,872
Capital expenditures	2,723	2,637	3,609
Operating Segments | Trust and Investment Services
Segment Reporting Information [Line Items]
Interest income	0	0	0
Interest expense	0	0	0
Noninterest income	4,579	4,756	4,634
Income (loss) before income taxes	2,165	2,521	2,623
Net income (loss)	1,731	1,486	1,835
Depreciation and amortization	10	12	11
Total assets	0	0	0
Goodwill	0	0	0
Capital expenditures	0	11	4
Other
Segment Reporting Information [Line Items]
Interest income	380	341	94
Interest expense	1,402	1,028	878
Noninterest income	76	247	23
Income (loss) before income taxes	(1,940)	(1,274)	(1,545)
Net income (loss)	(1,533)	(693)	(1,020)
Depreciation and amortization	0	0	0
Total assets	251,434	236,644	229,241
Goodwill	0	0	0
Capital expenditures	0	0	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Interest income	0	0	0
Interest expense	0	0	0
Noninterest income	0	0	0
Income (loss) before income taxes	0	0	0
Net income (loss)	0	0	0
Depreciation and amortization	0	0	0
Total assets	(241,625)	(227,213)	(220,232)
Goodwill	0	0	0
Capital expenditures	$ 0	$ 0	$ 0